Here's why:
* Conformation: Their conformation, particularly their shorter, stockier build, is not ideal for jumping. Their legs may not be long enough or strong enough to easily propel them over obstacles.
* Gait: Their signature walking gait is designed for smoothness and comfort, not for the explosive power needed for jumping.
* Training: Most Tennessee Walking Horses are trained for pleasure riding, trail riding, and showing in their unique gaits, rather than jumping.
This isn't to say that a Tennessee Walking Horse *can't* jump. With the right training, a horse with a good build and temperament could potentially learn to jump, but it is not their strong suit.
If you're looking for a horse for jumping, you would likely be better off with a horse bred and trained for that purpose, such as a Thoroughbred, Warmblood, or Quarter Horse.